DTDC Courier & Cargo — Parcel missing

I have send my very important original documents via dtdc courier service prabhat nagar meerut on 04/07/2020 and they gave me consignment no. As z51841247 till 25 june those documents were not received so that i was worried about my parcel. I have raised query on mail i. E. [protected]@dtdc.com on 24 july 2020 and till now i did not receive any response from dtdc service today 5 august 2020 i called on customer care number i. E. [protected] but they disconnect my call i am very disappointed from this service also worried about my original documents. Now if i am tracking this consignment number data is not coming. Now tell me what to do. I asked with that office executive in prabhat nagar meerut they told me that might be that document has been lost or missing i dont know what to do those documents are very important for me please help me out as soon as possible.